103 DIPTERA OF NORTH AMERICA. [PART III. 



the discal cell is a liUle larger than a rectangle. The coloring of 

 the surface of the wing is an uneven brown ; the design is formed 

 of the usual three hyaline crossbands, the first of which, however, 

 is but little apparent. The portion of the surface of the wing 

 lying beyond the last hyaline crossband is rather dark-brown, 

 more brownish-yellow towards the anterior more grayish-brown 

 towards the posterior margin ; the interval between the third 

 and second bands is dark-brown below the fourth longitudinal 

 vein, above it, yellowish-brown with dark-brown borders ; the 

 latter are broader, even sometimes coalescent, within the sub- 

 marginal cell ; the interval between the second and the first 

 hyaline crossbands is dark-brown, its inner portion more yellow- 

 ish-brown ; the basis of the wing yellowish-brown ; beyond the 

 fifth longitudinal vein the brown coloring still continues, but soon 

 verges on grayish. The first crossband has the same position as 

 in the preceding species ; only it is broader, less attenuated, and 

 much shorter ; its outline can be plainly visible only when the 

 surface of the wing is viewed in an oblique direction ; the second 

 pale crossband, which is very oblique, begins below the tip of 

 the costal cell, in the marginal cell, and reaches as far as the 

 fifth longitudinal vein, which it touches already before the poste- 

 rior corner of the discal cell; this band is but little curved; about 

 its middle, it is more or less expanded in the shape of an angle, 

 in consequence of its margin (the one nearest to the apex of the 

 wing), between the third and fourth longitudinal veins, not run- 

 ning in the direction of the band itself, but being more or less 

 perpendicular to the axis of the wing ; the third hyaline band, 

 running at some distance from the apex of the wing, is very 

 steep, but by no means entirely perpendicular, and somewhat 

 broader anteriorly than posteriorly; it begins at the anterior 

 margin and completely or almost completely reaches the posterior 

 one. 



Hab. Nebraska (Dr. Hayden). 



Gen. II. CAMPTONEIJRA MACQ. 



Charact.-~~ Body slender, feet rather long ; the hairs very short every- 

 where ; the thorax with bristles on the lateral and posterior margins 

 only. 



Antenna long and narrow ; the second joint short. Face almost shield- 

 shaped, convex, with rather indistinct foveae. 



